apparently there are private hacks for black ops 2 steam version. I just came into one player who was using that aimbot on sight and ESP today.
Search on youtube for [Black Ops 2 22-4-2014 Wall hack & aimbot] Video proof.

And yes i report BO2 mp hackers, i want to keep it clean so i can play with others fair and square. If you wanna hack, go ahead and hack anything you want except for BO2 MP. If i catch you on BO2 MP i will record you just like this one and send to Activision Support twitter.